{
  "id": "UBL-SR-05",
  "country": "EU",
  "syntax": "ubl",
  "group": "syntax",
  "severity": "fatal",
  "severity_note": "fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.",
  "spec": "Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL",
  "statement": "Payment terms shall occur maximum once",
  "statement_lang": "en",
  "context": "/ubl:Invoice | /cn:CreditNote",
  "test": "(count(cac:PaymentTerms/cbc:Note) <= 1)",
  "meaning": "Payment terms shall occur at most once. The statement has no period, says shall, and is shorter than 40 characters. The flag is fatal. The context is the same string as BR-CO-18. The published test counts payment terms notes, not the PaymentTerms element. The comparison has a space before <= and a space after it.",
  "fix": "Send at most one payment terms note.",
  "example_fail": "The invoice has two payment terms notes.",
  "example_pass": "The invoice has one payment terms note, or none.",
  "example_note": "Illustration of the condition in the official statement. Not an example published by the source.",
  "source_url": "https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-05/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}